the ntsb is looking into the conditions on interstate 84 and the guardrail the tour bus crashed through yesterday morning. more than 40 people were aboard the bus headed from las vegas to vancouver, canada. the bus was carrying mostly exchange students from south korea. >>> well, new york doctors say that secretary of state hillary clinton is making excellent progress in recovering from that blood clot. they also revealed that the close is in the space between the brain and the skull behind the right ear. they say that she did not have a stroke, that she will remain in the hospital for at least another day. president clinton visited her today. that blood clot was found after she suffered a concussion earlier this month and that happened when she stumbled and fell while she was sick with a stomach virus. doctors are giving clinton blood-thinning drugs to dissolve the clock and prevent new once. >> cbs reporter bigad shaban on how the clots can form. >>> reporter: secretary of state hillary clinton has a blood clot behind her right here in a vein between her brain and skull. clinton's doc